# -*- coding: utf-8 -*-
#
# Tencent is pleased to support the open source community by making 蓝鲸智云PaaS平台社区版 (BlueKing PaaS Community Edition) available.
# Copyright (C) 2017-2019 THL A29 Limited, a Tencent company. All rights reserved.
# Licensed under the MIT License (the "License"); you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://opensource.org/licenses/MIT
#
# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
# an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.
#
class ResourceRegistry(type):
    """
    A registry of all Resources subclassed
    """

    def __init__(cls, name, bases, nmspc):
        super().__init__(name, bases, nmspc)
        if not hasattr(cls, 'registry'):
            cls.registry = set()

        cls.registry.add(cls)
        cls.registry -= set(bases)  # Remove base classes

    # Meta methods, called on class objects:
    def __iter__(cls):
        return iter(cls.registry)


class BCSResource(metaclass=ResourceRegistry):
    pass
